Discrete vortex method of two-dimensional jet flaps.

The three joint bending propulsion mechanism as a simplified model offish propulsion is investigated. A numerical method for a coupled system of the bending propulsion mechanism and the fluid is developed, based on the two-dimensional discrete vortex method. The characteristics of the propulsive speed of the three joint bending propulsion mechanism are numerically and experimentally investigated. It is found that the propulsive speed has a maximum numerical and experimental value when all the phase differences of the joints are about zero for four amplitude patterns. The experimental propulsive speeds are found to be 65 ∼ 80 percent of the numerical ones.

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170 Numerical Simulation of Flow around a Corrugated Airfoil by Two-Dimensional Discrete Vortex Method

The Proceedings of Conference of Tohoku Branch ◽

10.1299/jsmeth.2013.48.142 ◽

2013 ◽

Vol 2013.48 (0) ◽

pp. 142-143

Author(s):

Yixing LI ◽

Joe YOSHIKAWA ◽

Masaya SHIGETA ◽

Seiichiro IZAWA ◽

Yu FUKUNISHI

Keyword(s):

Numerical Simulation ◽

Vortex Method ◽

Two Dimensional ◽

Discrete Vortex ◽

Discrete Vortex Method

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Theoretical Study on the Flow About Savonius Rotor

Journal of Fluids Engineering ◽

10.1115/1.3242410 ◽

1984 ◽

Vol 106 (1) ◽

pp. 85-91 ◽

Cited By ~ 31

Author(s):

Takenori Ogawa

Keyword(s):

Dimensional Analysis ◽

Theoretical Study ◽

Separated Flow ◽

Vortex Method ◽

Experimental Results ◽

Two Dimensional ◽

Discrete Vortex ◽

Discrete Vortex Method ◽

Savonius Rotor ◽

Singularity Method

A method for the two-dimensional analysis of the separated flow about Savonius rotors is presented. Calculations are performed by combining the singularity method and the discrete vortex method. The method is applied to the simulation of flows about a stationary rotor and a rotating rotor. Moreover, torque and power coefficients are computed and compared with the experimental results presented by Sheldahl et al. Theoretical and experimental results agree well qualitatively.

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Parallel Simulation of a Marine Riser Using MPI

23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B ◽

10.1115/omae2004-51123 ◽

2004 ◽

Author(s):

Ricardo Becht Flatschart ◽

Julio Romano Meneghini ◽

Jose´ Alfredo Ferrari

Keyword(s):

Message Passing ◽

Message Passing Interface ◽

Vortex Method ◽

Two Dimensional ◽

The Finite Element Method ◽

Marine Riser ◽

Discrete Vortex ◽

Discrete Vortex Method ◽

System A ◽

The Time Domain

In this paper the dynamic response of a marine riser due to vortex shedding is numerically investigated. The riser is divided in two-dimensional sections along the riser length. The Discrete Vortex Method is employed for the assessment of the hydrodynamic forces acting on these two-dimensional sections. The hydrodynamic sections are solved independently, and the coupling among the sections is taken into account by the solution of the structure in the time domain by the Finite Element Method. Parallel processing is employed to improve the performance of the method. The simulations are carried out in a cluster of Pentium IV computers running the Linux operating system. A master-slave approach via MPI — Message Passing Interface — is used to exploit the parallelism of the present code. The riser sections are equally divided among the nodes of the cluster. Each node solves the hydrodynamic sections assigned to it. The forces acting on the sections are then passed to the master processor, which is responsible for the calculation of the displacement of the whole structure. Scalability of the algorithm is shown and discussed.

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